Question

任何人都可以告诉我为什么这段代码不起作用？我试图将DataTable（数据表数组）与网格视图控件绑定，但网格视图不显示任何数据，并且运行代码时没有显示错误。



void GetTop()
        {
            int DtIndex = Convert.ToInt32(TxtNoGroups.Text);
            String cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            DataTable[] Groups = new DataTable[DtIndex];
            using (SqlConnection con = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("select top 4 * from student ORDER BY GRADE DESC", con);
                con.Open();
                SqlDataReader rdr = cmd.ExecuteReader();
                DtTopStudents = new DataTable();
                DtTopStudents.Load(rdr);
                for (int i = 0; i < DtTopStudents.Rows.Count; i++)
                {
                    Groups[i] = new DataTable();
                    Groups[i].TableName = "Group" + i;
                    Groups[i].Columns.Add("ID");
                    Groups[i].Columns.Add("Name");
                    Groups[i].Columns.Add("Grade");
                }

                for (int i = 1; i < DtIndex; i++)
                {
                    dr = Groups[i].NewRow();
                    dr = DtTopStudents.Rows[i];
                    Groups[i].ImportRow(dr);
                }
            }
            GridView1.DataSource = Groups[0];
            GridView1.DataBind();
        }

void GetTop() { int DtIndex = Convert.ToInt32(TxtNoGroups.Text); String cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString; DataTable[] Groups = new DataTable[DtIndex]; using (SqlConnection con = new SqlConnection(cs)) { SqlCommand cmd = new SqlCommand("select top 4 * from student ORDER BY GRADE DESC", con); con.Open(); SqlDataReader rdr = cmd.ExecuteReader(); DtTopStudents = new DataTable(); DtTopStudents.Load(rdr); for (int i = 0; i < DtTopStudents.Rows.Count; i++) { Groups[i] = new DataTable(); Groups[i].TableName = "Group" + i; Groups[i].Columns.Add("ID"); Groups[i].Columns.Add("Name"); Groups[i].Columns.Add("Grade"); } for (int i = 1; i < DtIndex; i++) { dr = Groups[i].NewRow(); dr = DtTopStudents.Rows[i]; Groups[i].ImportRow(dr); } } GridView1.DataSource = Groups[0]; GridView1.DataBind(); }

Answer 1

调试并检查Groups [0]是否有数据或是否为null，如果没有数据则返回1步并控制DtTopStudents ......

Asp.NET GridView在与数据表绑定后不显示数据

1 个答案: